Find the sum of first 22 terms of an AP in which d=7 and 22nd term is

1.	Find the sum of first 22 terms of an AP in which d=7 and 22nd term is 149
Answer» 1661 Answer is 1661 S22 came 1661 Use formula.... n/2{ 2a + (n-1)d} n is 22....a is 2...d is 7 Then ur a =2 Firstly....a +21d = 149

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