11. The 24 term of an AP is twice its 10term. Show that 72 term is 4 times its 15 term
12. Find all the number of all three-digit natural numbers which are divisible by 9.
13. Find the sum of all 3 digit natural numbers which are multiples of 11.
14. The fourth term of an AP is equal to 3 times the first term and seventh term exceeds twice the third
term by 1. Find the first term and the common difference.
15. If the 7" term of an AP is and 9 term is , find the 63" term.
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