exam Maths Puzzle Numerical Ability

how do you know exactly when the problem is a combination or a permutation?
how do you label the problem? ex. 4 super script c 3? how do you solve these?

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exam Other Question

Please help me with this problem:
A company had 120,000 shares of common stock outstanding on January 1 and then sold 40,000 additional shares on March 30. Net income for the year suppose tht 12 dimes and nickels are worth 95 cents . how many dimes and nickels are there??