If an A.P. is 1,7,13, 19, ……… Find the sum of 22 terms.(a) 127(b) 1204(c) 1408(d) 1604I had been asked this question in homework.My doubt stems from Arithmetic Progression(A.P.) in section Sequences and Series of Mathematics – Class 11

If an A.P. is 1,7,13, 19, ……… Find the sum of 22 terms.(a) 127(b

1.	If an A.P. is 1,7,13, 19, ……… Find the sum of 22 terms.(a) 127(b) 1204(c) 1408(d) 1604I had been asked this question in homework.My doubt stems from Arithmetic Progression(A.P.) in section Sequences and Series of Mathematics – Class 11
Answer» The correct option is (C) 1408 To EXPLAIN: From the given A.P., a=1 and d=7-1 = 6. We know, Sn = \(\frac{n}{2} (2a+(n-1)d)\) S22 = \(\frac{22}{2} (21+(22-1)6)\) = 11(2+216) = 11(2+126) = 11*128 = 1408.

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If an A.P. is 1,7,13, 19, ……… Find the sum of 22 terms.(a) 127(b) 1204(c) 1408(d) 1604I had been asked this question in homework.My doubt stems from Arithmetic Progression(A.P.) in section Sequences and Series of Mathematics – Class 11

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