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b)
a + 21d = 149
a = 149 - 21 * 7
a = 149- 147
a = 2
now ,
sum of first 22 terms = 22/2 ( 2*2 + 21 * 7)
= 11* (4+ 147)
= 11* 151
= 1661
a + 21d = 149
a = 149 - 21 * 7
a = 149- 147
a = 2
now ,
sum of first 22 terms = 22/2 ( 2*2 + 21 * 7)
= 11* (4+ 147)
= 11* 151
= 1661
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