a, ar, ar²

2ar = a + (ar² - 64)

(ar - 8)² = a(ar² - 64)

r = 13, 5

a = 4/9, 4

Nos. = 4, 20, 100

or

4/9, 52/9, 676/9

Question 6 solve

Detail solution plz

Nos in form XX = 9

Nos in form XXX = 9

Nos in form XYX = 9*9 = 81

Palindrome Nos After 1000

1001,

Total = 100

(n + 4)(n - 3)/(n - 4)(n - 3)

(n + 4)/(n - 4)

1 + 8/(n - 4)

n - 4 = 8

n = 12

Soln

ABC divisible by 4

So BC can be 12, 24, 32, 52

BCD is divisible by 5 so D = 5

CDE is divisible by 3 = (5, 1, 3), (5, 4, 3)

(153, 351, 354, 453)

C = 4, B = 2, E = 3

So A = 1