Question

in an AP the 10th term is 46 the sum of 5th and 7th term is 72 then find AP​

Answer 1

Answer: a = 23.5 , d = 2.5

Step-by-step explanation:

t10 = a+9d = 46   ...... 1

t5 + t7

= a + 4d + a + 6d

= 2a +10d = 72 ⇒ a + 5d = 36    ...... 2

eq 1 - eq 2 :

4d = 10

d = 2.5

a = 36 - 5d = 36 -12.5 = 23.5