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