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Find the sum of first: a] 13 term of AP 2, 6, 10, 14, ..... b] 20 terms of AP -6, 0, 6, 12, ...... c] 15 term of AP 18, 16, 14, .........

Answer»


ANSWER :a] `= (13)/(2) [ 4+ 48] = (13)/(2) xx 52 = 338`
b] `= 10 [ -12 + 114] = 10 xx 102 = 1020`.
c] `= (15)/(2)[ 16 - 28] = (15)/(2)xx - 12 = -90`.


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