1.

Find the sum of first 22 terms of an A.P. in which d = 22 and a22 = 149.

Answer»

a22= a + 21d 

149 = a + 21(22)

a = 149 – 462 

a = -313

S22\(\frac{22}{2}\) [2a + (22 - 1)d]

= 11 [-626 + 462]

= 11 (-164)

= -1804



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