find the sum of terms of the A.P : 4,9,14,.........,89
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hey friend !!!!!
total term of AP = 18
then sum of the AP =
18 /2(2×4 + (18-1)×5)
= 9 (8+85)
= 9 × 93 = 837
hope it will help you..
total term of AP = 18
then sum of the AP =
18 /2(2×4 + (18-1)×5)
= 9 (8+85)
= 9 × 93 = 837
hope it will help you..
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