Question

9. Find the sum of AP. 2, 7, 12 ............. upto 10 terms.​

Answer 1

Step-by-step explanation:

a = 2

d = 7 - 2 = 5

an = a + ( n- 1 )d

a10 = 2 + ( 10 - 1 )5

      = 2 + ( 9 )5

      = 2 + 45

      = 47

Sn = n( a + l)/2

S10 = 10( 2 + 47 )/2

      = 5( 49 )

      = 245

So 240 is the sum of the given A.P. till 10 terms

I HOPE IT HELPS

Answer 2

Answer: 245

Step-by-step explanation:

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