Question

in an AP T10 =175 and T20 =475 find out the AP​

Answer 1

Step-by-step explanation:

n th term of AP, Tn = a + (n-1)d

T10 = a + 9d = 175. (i)

T20 = a + 19d = 475. (ii)

subtracting (I) from (ii)

10d = 300

d = 30. (iii)

implies that, a= 175 - 9d

= 175 - 270

= -95

implies that the AP is with first term -95 and common difference as 30.

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